[llvm] [AMDGPU] GISelShouldIgnore .td uses (PR #90005)

[via llvm-commits]

jofrn wrote:

> Most or all of these shouldn't be added. The point is to silence the warnings for cases where we _never_ want to import them. This is just hiding the useful warnings

It definitely isn't all because this applies ShouldIgnore to each (and every) Pattern that we have. At least one Pattern'd be bound to require this...

https://github.com/llvm/llvm-project/pull/90005